Metadata in SVG

As XML is extensible you can add attributes and element children as you wish. - SO

<svg xmlns="http://www.w3.org/2000/svg" xmlns:sol="http://www.sol.org">
  <circle cx="10" cy="20" sol:country="ruritania" r="5"/>
</svg>
Written on February 17, 2023, Last update on February 17, 2023
svg metadata